Final answer:
The First Thanksgiving occurred after the Pilgrims had a successful harvest in Plymouth, Massachusetts in 1621. The feast was a peaceful event where the Pilgrims and around one hundred Wampanoag Indians, led by Massasoit, exchanged and shared a meal. The account of this event was provided by Edward Winslow, a fellow traveler.
Step-by-step explanation:
The event that led to the First Thanksgiving was the successful harvest that the Pilgrims experienced after settling in Plymouth, Massachusetts. This answer corresponds to option b) The Pilgrims and Native Americans celebrated a successful harvest with a feast. The first Thanksgiving took place in September or October of 1621, when the Pilgrims feasted with around one hundred Wampanoag Indians, who were led by Massasoit. Together they shared a feast that included venison, fish, fowl, and beer. During the feast, there were no pumpkin pies or cranberry sauces, and they used only knives as eating utensils. The rest of the meal was eaten with their fingers while lounging on the floor. This event took place after Massasoit and his people concluded a peace treaty with the Pilgrims. Edward Winslow provided a detailed account of this feast.
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